27
COMPILER TECO/ATI
ENDORSED
DATE
29.02.2004
REG. CODE
1-5302-633
MODEL N°
51074
DATE OF ISSUE
02-04
REVISION
00
XI
36
37
38
39
D
1
2
9
7
5
3
4
6
8
10
G
F
E
B
C
A
H
L
I
M
O
P
N
0,24
5
0,25
INJECTION EQUIPMENT
Number
of holes
Diameter of steel
wire (mm)
Diameter
of holes (mm)
2. Mount the injector on the test bench (code
00365R0430
, fig. 40).
Disconnect the pressure gauge and rapidly operate the lever.
The nozzle must make the characteristic "trilling" sound and
inject with a good atomizing action.
3. Connect the pressure gauge. Slowly depress the level in a
continuous way until injection occurs.
The injector needle must "open" at the pressure of 230 to 238
bar. Vary the washer shims (N° 5 fig. 38) to calibrate in the
correct way.
4.
Leak test:
operate the test bench lever until the gauge pointer
is 20 Kg/cm² below the injection pressure value. Nozzle
tightness is good if no fuel comes out within 10 sec.
5.
Checking for leaks on the nozzle return phase:
operate the
test bench lever until the gauge pointer is 20 Kg/cm² below the
injection pressure value. Release the lever and
Leak test
Plug the fuel return union and let air in through the fuelling union at
a pressure of
6 Kg/cm²
. Fully immerse the pump in a receptacle
containing diesel fuel for about 50 - 60 seconds (fig. 37) and make
sure that no bubbles appear.
NOTE: the position of the pump adjuster sleeve is of no importance
for this test.
Injector
Details of fig. 38:
1. Filter - 2. Fuel inlet union - 3. Fuel return union - 4. Nozzle holder
- 5. Calibration washer - 6. Spring - 7. Pressure rod - 8. Spacer - 9.
Nozzle - 10. Ring nut.
Injector inspection and calibration
1. Clean the nozzle holes with a thin steel wire (fig. 39) with the
following diameters:
5. Insert the adjuster sleeve unit and plunger (L) into the pump
casing (A), making sure that the helical profile is directed on a
level with the return union with ball.
6. Fit in the adjuster block (M), matching the reference marks
applied during the demounting phase.
7. Tighten the plug (N) to a
0.5 to 0.6 Nm
torque, locking it in place
with Loctite 290.
8. Insert the spring (O) and lower cap (P).
9. Compress the tappets in the various operating positions to
check that the adjuster sleeve (L) slides perfectly. Resistance
or jamming will make the engine to hunt during operation.
